With our Declutter feature, messages that fail to meet certain weight or reputation standards are not shown by default in the Quarantined Message Report or quarantine. However, all messages may be viewed by selecting the check box next to Show Clutter (known sources of junk) in your quarantine.

You will notice the following message at the bottom of the Quarantined Message Report as all reports are now decluttered.

NOTE:  Messages from known sources of junk are not included in this report but may be viewed in your quarantine.